MVC及MVC Core在filter中如何獲取控制器名稱和Action名稱

不少時候咱們須要使用過濾器來實現一些攔截、驗證等行爲，此時咱們能獲取到的Context是ActionExecutingContext ，咱們如何經過這個Context來得到Action、Controller等對象呢？記錄下：

在代碼中

[AttributeUsage(AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
public class ViewLogAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        base.OnActionExecuting(filterContext);
    }
}

更加簡潔的辦法：

var areaName = filterContext.ActionDescriptor.RouteValues["area"];

var controllerName = filterContext.ActionDescriptor.RouteValues["controller"];

var actionName = filterContext.ActionDescriptor.RouteValuse["action"];

1.獲取控制器名稱代碼 

MVC中

var controllerName = filterContext.ActionDescriptor.ControllerDescriptor.ControllerName;

MVC Core中需強行轉下

var controllerName = ((Microsoft.AspNetCore.Mvc.Controllers.ControllerActionDescriptor)filterContext.ActionDescriptor).ControllerName;

或者使用

filterContext.Controller.GetType().Name

MVC中還能夠

var controllerName = HttpContext.Current.Request.RequestContext.RouteData.Values["Controller"];

2.獲取Action名稱代碼

var actionName = filterContext.ActionDescriptor.ActionName;

 或

var actionName = HttpContext.Current.Request.RequestContext.RouteData.Values["Action"];

 3.獲取Action參數名稱

//獲取參數數組
var arrParameter = filterContext.ActionDescriptor.GetParameters();
//根據索引獲取對應參數名
var paramName = arrParameter[0].ParameterName;

4.獲取參數值

var parameterValue = filterContext.Controller.ValueProvider.GetValue(paramName).RawValue;

若是能夠肯定參數名稱能夠直接用ActionParameters經過Key來獲取，Key指參數名稱

var parameterValue = filterContext.ActionParameters["KeyName"];